Investigation On Preparation And Optical Properties Of Doping CaSrNb₂O₆as A Substrate For White Light-emitting Materials

This thesis adopted the high temperature solid phase method,successfully prepared the white light fluorescent materials based oncalcium niobate mixing series of elements, studied the luminousproperty of bismuth, sr, indium mixing calcium niobate series, and theinfluence from the alkaline metal ion to the luminous intensity ofCaSrNb₂O₆：Bi³⁺.The above luminescent material was proceeded withall sorts of test methods of characterization such as the X-raydiffraction（XRD）, scanning electron microscope（SEM）, fluorescencespectrum （PL） and so on. Meanwhile, studied the influence the reactionconditions impacted on the granular appearance, luminous intensity,and the structure of the sample. Also probed into the impact ofdifferent doping density of doping ion on the luminous property of thesample, and studied the emitting mechanism of the sample.Prepared the CaSrNb₂O₆：Bi³⁺ by using the high temperature solidmethod, also studied the impact of bismuth ion on the luminousproperty of the calcium niobate. The luminous intensity of calciumniobate was effectively improved by mixing the Bi³⁺, By the research ofthe calcining temperature, soaking time and doping concentration, itwas finally confirmed that the best doping concentration of bismuth ionis0.2%, the optimum reaction conditions is1300℃calcinations and1.5hheat preservation, and it belonged to orthorhombic system crystal ofsingle phase after doing the X ray diffraction detection. When testingthe luminous intensity of the sample by using the fluorescencespectrometer, it inspired with the315nm ultraviolet, and the sampleemission peak was in the scope of350-600nm,it was white lightphosphor. The material preparation was of low cost, simple preparationtechnology, and the reaction conditions demand was not high, thechemical and physical properties were stable, and shine life was long. It enormously improved the possibility of the application in industrialproduction.When preparing the CaSrNb₂O₆： Bi³⁺ by using the hightemperature solid method, blended with the alkaline metal ion （Na⁺，K⁺，Li⁺）. The introduction of the alkaline metal ion filled the vacancy ofthe positive charge in the structure of CaSrNb₂O₆: Bi³⁺. Studied theinfluence the alkaline metal ion impacted on the niobium acid calciumstrontium bismuth crystal structure. Discussed the mechanism of the lightand the reason that the introduction of Na⁺，K⁺，Li⁺generated differentstructures. There into, Li⁺had the best effect, and it determined the bestdoping concentration of1%. In the excitation spectra of250-400nm, itstimulated the highest peak when in315nm. Therefore, when the315nm ultraviolet stimulate was adopted, the launching of the peakintensity was the strongest., when it was between350-600nm, it belongto the white light launch areas, and it was the highest peak when at460nm. The light intensity was improved than before.Took the calcium niobate as matrix, and also the high temperaturesolid phase method for the preparation of In³⁺ doping with CaNb₂O₆：In³⁺ luminous materials, studied the influence different reactionconditions impacted on the luminous property of the sample. By theXRD detection, concluded that the luminescence materials waslayered Perovskites structure, and doping In³⁺ didn’t cause thechanges in the structure of calcium. On the contrary, the luminousintensity of calcium niobate was improved. As the temperatureincreased, the fluorescence intensity was gradually increasing. Butwhen the temperature was over1300℃, the temperature quenched, sothe luminous intensity was gradually decreasing. Identified that the bestdoping concentration was0.6%, calcining heat was1300℃, andsoaking time was1.5h, the sample prepared on this condition had thebest glow effect. When the315nm ultraviolet stimulate was adopted, the launch peak in350-600nm can be obtained, and the luminousintensity in460nm was the strongest...